from django.shortcuts import render
from django.views import View
from django.core.paginator import Paginator
from goods.models import GoodsCategory, SKU,GoodVisitCount
from meiduo_mall.utils.my_category import get_categories
from django import http

from meiduo_mall.utils.my_crumbs import get_crumbs
import time
from datetime import datetime

from meiduo_mall.utils.response_code import RET


class SkuListView(View):
    def get(self,request,category_id,page_num):

        #1,获取分类信息,获取参数
        categories = get_categories()
        sort = request.GET.get("sort","default")

        #1.1 根据sort设置排序方式
        if sort == "price":
            sort_field = "-price"
            sort = "price"
        elif sort == "hot":
            sort_field = "-sales"
            sort = "hot"
        else:
            sort_field = "-create_time"
            sort = "default"


        #2,获取分类对象
        category = GoodsCategory.objects.get(id=category_id)


        #3,分页查询
        skus = SKU.objects.filter(category_id=category_id).order_by(sort_field)
        paginator = Paginator(object_list=skus,per_page=5) #创建分类对象,每页5条
        page = paginator.page(page_num)# 获取page_num页
        skus_list = page.object_list #获取page_num中的所有的对象
        current_page = page.number #当前页
        total_page = paginator.num_pages #总页数


        #拼接数据,返回响应
        context = {
            "categories":categories,
            "category":category,
            "skus_list":skus_list,
            "current_page":current_page,
            "total_page":total_page,
            "sort":sort
        }

        return render(request,'list.html',context=context)

class HotSkuListView(View):
    def get(self,request,category_id):
        #1,根据销量获取两个sku对象
        skus = SKU.objects.filter(category_id=category_id).order_by("-sales")[:3]

        #2,拼接数据
        hot_sku_list = []
        for sku in skus:
            sku_dict = {
                "id":sku.id,
                "default_image_url":sku.default_image_url.url,
                "name":sku.name,
                "price":sku.price
            }
            hot_sku_list.append(sku_dict)


        #3,返回响应
        return http.JsonResponse({"hot_sku_list":hot_sku_list})

class SKUDetailView(View):
    def get(self,request,sku_id):

        #1,获取分类数据
        categories = get_categories()

        #2,获取面包屑数据
        category = get_crumbs(sku_id)

        #3,查询商品sku对象
        sku = SKU.objects.get(id=sku_id)

        #4,商品sku规格信息
        # 构建当前商品的规格键
        sku_specs = sku.specs.order_by('spec_id')
        sku_key = []
        for spec in sku_specs:
            sku_key.append(spec.option.id)
        # 获取当前商品的所有SKU
        skus = sku.spu.sku_set.all()
        # 构建不同规格参数（选项）的sku字典
        spec_sku_map = {}
        for s in skus:
            # 获取sku的规格参数
            s_specs = s.specs.order_by('spec_id')
            # 用于形成规格参数-sku字典的键
            key = []
            for spec in s_specs:
                key.append(spec.option.id)
            # 向规格参数-sku字典添加记录
            spec_sku_map[tuple(key)] = s.id
        # 获取当前商品的规格信息
        goods_specs = sku.spu.specs.order_by('id')
        # 若当前sku的规格信息不完整，则不再继续
        if len(sku_key) < len(goods_specs):
            return
        for index, spec in enumerate(goods_specs):
            # 复制当前sku的规格键
            key = sku_key[:]
            # 该规格的选项
            spec_options = spec.options.all()
            for option in spec_options:
                # 在规格参数sku字典中查找符合当前规格的sku
                key[index] = option.id
                option.sku_id = spec_sku_map.get(tuple(key))
            spec.spec_options = spec_options

        #携带数据渲染页面
        context = {
            "categories":categories,
            "category":category,
            "sku":sku,
            "specs":goods_specs
        }

        return render(request,'detail.html',context=context)

class GoodsVisitView(View):
    def post(self,request,category_id):
        #1,获取分类对象
        try:
            category = GoodsCategory.objects.get(id=category_id)
        except Exception as e:
            return http.HttpResponseForbidden("分类不存在")

        #2,获取当天时间
        local_time = time.localtime()
        current_str = "%d-%02d-%02d"%(local_time.tm_year,local_time.tm_mon,local_time.tm_mday)
        current_date = datetime.strptime(current_str,"%Y-%m-%d")

        #3,获取分类对象中的访问数量
        try:
            visit_count = category.visit_counts.get(date=current_date)
        except Exception as e:
            visit_count = GoodVisitCount()

        #4,设置访问对象的属性
        visit_count.category_id = category_id
        visit_count.date = current_date
        visit_count.count += 1

        #5,数据入库
        visit_count.save()

        #4,返回响应
        return http.JsonResponse({"code":RET.OK,"errmsg":"success"})

